Locking ring for pipes



FIG. 1 is a perspective view of a locking ring for pipes, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an bottom plan view thereof;

FIG. 4 is a front plan view thereof; and,

FIG. 5 is a back plan view thereof. 

CLAIM The ornamental design for a locking ring for pipes, as shown and described. 